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BRAF ANTIBODY EXPRESSION IN DIFFERENT TYPES OF THYROID NODULAR LESIONS.
Georgian Medical News 2017 October
Major problems haunt the physicians who need to delineate the best management strategy for their patients with thyroid nodule is the identification of the most aggressive cases, especially among papillary thyroid cancers, which would benefit from more aggressive therapy and follow up. Beyond its strong correlation with PTC, the BRAF mutation is well described to associate with poor prognosis. The aim of our study was to identify BRAF antibody expression in different hystotypes of the thyroid nodules and assessment of it expression according to the tumor aggressiveness. Immunohistochemical staining was performed in 54 of surgically resected thyroid nodules, including malignant and benign cases, grouped according to the tumor aggressiveness. We have used selected thyroid specific markers: BRAF antibody, CD-56, CK-19, HBME-1 and KI-67. Adenomatous hyperplasia's and follicular lesions doesn't reveal positivity to the expression of BRAF antibody. Encapsulated papillary carcinomas included in our work revealed negative or very poor positivity of BRAF antibody. This fact strengthen the hypothesis that encapsulated papillary carcinomas have an indolent behavior and is genetically distinct from infiltrative tumors. We revealed 55,5% positivity of BRAF antibody in the cases of papillary microcarcinomas, this fact creates a need for more cautious approach to this type of tumors. The degree of BRAF antibody expression increased with a rising of tumor aggressiveness in our histopathologic groups (P<0,005). All cases of papillary carcinoma with multinodular involvement and extrathyroid extension revealed moderate or strong positivity of BRAF antibody expression.
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